Locking and automatic tightening device for conoidal mounts.



J. E. KENNEDY. LOCKING AND AUTOMATIC TIGHTENING DEVICE FOR CON APPLICATION FILED SEPT- 5, I916.

OIDAL MOUNTS.

5 vwemtoz 4; a Mom 121 Patented Jilly 3, 1917.

2 EEEEEEEEEEEE I J. E. KENNEDY. LOCKING AND AUTOMATIC TIGHTENING DEVICE FOR CONOIDAL MOUNTS.

APPLICATION FILED SEPT- 5. I916- LQSHEME PatentedJul 1917.

2 SHEETS 2.

E] mum V607 JOSEPH E. KENNEDY, 01E NEW YORK, N. Y.

Looms AND AUTOMATIC TIGHTENING- DEVICE FOR CONOIDAL MOUNTS.

Specification of Letters Patent.

Patented July a, 1911 v.

Application filed September 5, 1916. Serial No. 118,371.

To all whom it may concern:

Be it'known that I, JOSEPH E. KENNEDY, a citizen of the United States, and a resident of the borough of Manhattan, city, county, and State of New York, have invented certain new and useful Improvementsin Locking and Automatic Tightening Devices for Conoidal Mounts, of which the following is a specification.

While applicable to conoidal mounts generally i. 6., as in crushing roll and similar mounts having conoidally tapered contact.

ing surfaces, my improvements are designed,

rectly in a cylindrical portion of the shaft immediately above and adjoining the upper or lesser diameter of such conoidal seat, and to so arrange the engaging male and female threads that the strain of work is utilized to tighten the nut and cause it to force down and hold the head firmly in position on its seat. It is also customary to use a plurality of these crushers arranged in series in conjunction with and relation to a common elevator for conveying off the products of reduction,the elevator being positioned medially with one or more crushers on either side thereof, and the crushers being driven 'by belts from acommon power shaft. Hence, in manufacture provision is made for driving some shafts in one direction and some in the opposite direction by mak ing the shaft and nut threads right hand in some cases and left'hand in others, so that all the shafts may be rotated in the proper directions by untwisted belts driven directly by a common driving shaft. This however necessitates the provision of two spare shafts in lieu of the one only necessary to becarried on hand where the threads on the gyratory shafts are all alike,and since the shafts for the larger crushers cost several thousand dollars each the cost of these extra emergency shafts becomes an important item.

Furthermore, the portion of the shaft in which the thread is cut becomes the Weakest part thereof, (a circumscribing line of least resistance) where it is most likely to yield or snap in case of undue strain; and the thread is also the most delicate part of the shaft, injury thereof necessitating the discarding of the whole shaft, which involves serious loss on account of initial cost as above intimated.

It is the main object of my invention to obviate these serious objections to the use of automatic tightening nuts for looking a crusher head or similar work member on a conoidal seat on a gyratory or other shaft, and this I accomplish mainly by the use of a male or peripherally threaded sleeve rigidly but detachably secured to the shaft and adapted for engagementwith thelocking nut by which the crusher head or similar work member is secured in position on ghe hshaft, as hereinafter more fully set ort By this means I not only avoid the expense and danger involved in the old method of weakening the shaft by the cutting of the male screw thread directly therein, whereby I add materially to the. strength and life of the shaft, but I also render it a comparatively simple and'inexpensive matter to substitute or replace the male thread and nut, 'and to' keep on hand a supply of male-thread sleeves and corresponding nuts, both rights and lefts for immediate use, the cost of the malethread sleeves being relatively small and unimportant as compared with that of the shafts, and the sleeves occupying little space in either transportation or storage. And by this means also a right hand shaft may be readily converted into one adapted to left hand rotation, or vice versa, according to circumstances and conditions of use. And the danger of inadvertently mounting a wrongly threaded shaft, which would result in the loosening of the head, is materially reduced.

In the accompanying drawings,

Figure 1, is a transverse section of a gymtory crusher shaft taken above the work broken away;

. and manganese steel mantle;

Fig. 4;, is a perspective view of the malethread-sleeve Figs. 5, and 6, are detail views of one of the gib keys used in securing the malethread-sleeve to the shaft;

. Figs. 7, and8, are detail views of one of the key blocks.

The gyratory shaft '8, is formed with the usual convexo-conoidal seat section 8, above the smaller, upper diameter of which I form the shaft in the present instance with. a

cylindrical portion 8, for the reception of the peripherally threaded male-screw sleeve M. This male-thread sleeve M, may obviously be rigidly secured to the shaft to insure its turning therewith, by means of various well known mechanical expedients without departing from the spirit and intent of my invention in this respect, so that I do not restrict myself to the identical method shown herein, which consists in keying the male-thread-sleeve to the shaft by means of gib keys la, is, fitting partly in re cesses or grooyes s 8 formed for them in the cylindrical portion 8, of the shaft S, and in corresponding grooves or recesses m, m, formed for them in the inner face of the male-thread-sleeve M. Key blocks b, b, are

provided to hold the gib keys'lc, la, in position, resting upon the top of the latter, and being screwed to the shaft. Four ofthese key fastenings are shown in the accompanyarranged at equi-distant used if made of sufficient size and propor tion, but I prefer to use a plurality of such key locks of relatively small proportion, equi-distantly positioned around the shaft so as to avoid weakening the latter while distributing the work strain equably.

The nut N, is preferably although not necessarily attached to the, work head H, by means of peripheral protuberances n, m, seated in corresponding recesses 12., it, in the head, as shown more particularly in Fig.

' 1,the annular space between the nut. and

the head being filled with zinc, z.

The work head H, is formed with a concavo-conoidal inner surface 72., for seating upon the convexo-conoidal surface s, of the shaft, a lining a, of zinc being interposed between them in theusual way. In Fig. 2,

a one piece head of chilled iron is shown, and the nut N, is set directly therein as above indicated, while in Fig. 3, the head consists of-a conoidal cast iron core 71?, and a conoidal mantle h of manganese steel in the upper edge of which the nut N, is set as before stated,z being the zinc lining usually interposed between the core if, and the mantle 7L8. In either case the result is the same in that the strain of work, acting through the male-thread-sleeve M, causes the nut to tighten the head upon its seat, provided of course that the direction of rotation is right hand for a left-hand-screw-threaded sleeve M, and left handed .for a right-handthreaded sleeve M, as hereinbefore indicated.

It will thus be seen that the distinctive feature of my present invention is the peripherally threaded sleeve M, as a substitute for the male-screW-thread heretofore cut directly in the shaft itself, the functions of the nut N, being essentially the same as heretofore as a self-tightener. I thus not only preserve the shaft intact, at its initial strength without weakening it at the point of greatest strain in use by the formation therein of a circumscribing line of least resistance caused by cutting the thread directly in and around the shaft inthe area of greatest torsional strain, but I also decrease the initial expense of manufacture, since the male threaded sleeve M, can be made for much less than the cost of cutting the thread directly in the shaft. And by detachably securing the male-thread-sleeve M, to the shaft, it is obvious that a damaged or worn thread may be replaced at comparatively slight cost and without discarding a whole shaft for the purpose as heretofore. F urthermore it renders each shaft readily adaptable for either right or left hand rotation, by means of right hand threaded sleeves and left hand threaded sleeves provided for the purpose, and readily substituted one for the other according to the requirements of installation and use.

What I claim as my invention and desire to secure by Letters Patent is, 1. In a mount of the character designated, the combination of a shaft formed with a convexo-conoidal seat section and with an unthreaded portion adjacent to the lesser diameter of said convexo-conoidal seat section, a work member formed with a concavo-conoidal surface contacting with said convexo-conoidal seat section of the shaft, a sleeve rigidly secured directly to sald unthreaded portion of the shaft adjacent to the lesser diameter of said conoidal seat section, said sleeve being formed with a peconveXo-conoidal seat section of the shaft, a sleeve rigidly and detachably secured directly to said unthreaded portion of the shaft adjacent to the lesser diameter of said conoidal seat section, said sleeve bein formed with a peripheral screw thread, and

a nut engaging said peripherally threaded sleeve and bearing against said seated Work member, for the purpose described.

3. In a mount of the character designated, the combination of a shaft formed with a convexo-eonoidal seat section and with an unthreaded portion adjacent to the lesser diameter of said convexo-conoidal seat section, a Work member formed with a concavo-conoidal surface contacting with said convexo-conoidal seat section of the shaft, a sleeve rigidly secured directly to said unthreaded portion of the shaft adjacent to the lesser diameter of said conoidal seat section, said sleeve being formed with a peripheral screw thread, and a nut afiixed to said work member and engaging said peripherally threaded sleeve, for the purpose set forth.

4. In a mount of the character designated, the combination of a shaft formed with a conVexo-conoidal seat section, a work member formed with a concavo-conoidal surface contacting with said shaft seat section, a peripherally-threaded sleeve keyed to said shaft adjacent to the lesser diameter of said conoidal seat section, and a nut engaging said peripherally-threaded sleeve, for the purpose described.

5. In a mount of the character designated, the combination of a shaft formed with a convexo-conoidal seat section, a work member formed with a concavo-eonoidal'surface contacting with said shaft seat section, a peripherally-threaded sleeve keyed to said shaft adjacent to the lesser diameter of said 00- noidal seat section, and a nut ailixed to said work member and engaging said peripherally-threaded sleeve, for the purpose described.

6. In a mount of the character designated, the combination of a shaft formed with a conveXo-conoidal seat section and with an unthreaded portion adjacent to the lesser diameter of said convexo-conoidal seat section, a work member comprising a core formed with a conoidal periphery and with a concavo-conoidal surface contacting with the said convexo-conoidal seat section of the shaft, and of a concavo-convex mantle seated on said core, a sleeve rigidly secured directly to said unthreaded portion of the shaft adjacent to the lesser diameter of its said conoidal seat section, said sleeve being formed with a peripheral screw thread, and a nut affixed to said mantle and engaging said peripherally threaded sleeve, for the purpose described.

7. In a mount of the character designated, the combination of a shaft formed with a conveXo-conoidal seat section and with an unthreaded portion adjacent to the lesser diameter of said convexo-conoidal seat section, a work member comprising a core formed with a conoidal periphery and with a concavo-conoidal surface contacting with said convexo-conoidal seat section of the shaft, and of a concavo-convex mantle seat- 

